Directives for the development of a 4-dimensional theory of human behaviour are formulated and discussed. The 3 spatial dimensions length, height and depth, and time are used as points of departure from which psychic analogues are defined as fundamental constructs of human behaviour. The psychological sphere described by these 3 psychic dimensions together with orientation towards time are then used as a basis of typifying and classifying human behaviour. Possibilities for the further development and validation of the theory as well as some of its practical applications are discussed.